Authors:
Stuart Reges, Marty Stepp
Chapter:
Introduction To Parameters And Objects
Exercise:
Exercises
Question:2 | ISBN:9780136091813 | Edition: 2
Question
Write a method called printPowersOf2 that accepts a maximum number as an argument and prints each power of 2 from 20 (1) up to that maximum power, inclusive. For example, consider the following calls:
printPowersOf2(3);
printPowersOf2(10);
These calls should produce the following output:
1 2 4 8
1 2 4 8 16 32 64 128 256 512 1024
You may assume that the value passed to printPowersOf2 is 0 or greater. (The Math class may help you with this problem. If you use it, you may need to cast its results from double to int so that you don’t see a .0 after each number in your output. Also try to write this program without using the Math class.)
Answer
Program:
public class Ch03Ex02
{
public static void main(String[] args)
{
printPowersOf2(3);
printPowersOf2(10);
}
public static void printPowersOf2(int maximum)
{
for (int i = 0; i <= maximum; i++)
{
System.out.print((int) Math.pow(2, i) + " ");
}
System.out.println();
}
}
Output:
1 2 4 8
1 2 4 8 16 32 64 128 256 512 1024